The direction your headed is likely to cause player frustration.
So I changed a bunch of things to be more gameplay friendly.
This means considering the use of contrast and details.
Notice the missile is white with black outline so it will be visible against any background.
And the wavy trail means you can identify it against other enemy projectiles without looking direction at it.
Assuming the box is something interactive, it receives a simpler shape with lit up button but not TOO contrasted against its immediate surrounding.
Realising now this is a platform game with gaps to avoid, it would be better to brighten the platform above what I've done here so you can actually see it.
Backgrounds themselves get less contrast since you don't want it to interfer visually or distract attention from anything interactive.
Made your guy more of a TV head but just occured to be...is he supposed to be a ninja?